Mac OS X 10.5.6, released today, includes graphics improvements aimed at Aperture as well as changes meant to enhance printing from Adobe's Creative Suite 3 applications and to Brother and Canon printers that connect via USB.

Apple's published information doesn't elaborate on what the specific graphics and printing improvements are in the new operating system release. Mac OS X 10.5.6 is available through the Software Update feature of 10.5.x or as a standalone updater.